Thelypodiopsis ambigua |
Thelypodiopsis |
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Long Valley tumble-mustard |
tumblemustard |
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Habit | Annuals or biennials; (glaucous), glabrous throughout. | Annuals, biennials, or, rarely, perennials; not scapose; glabrous or pubescent. | ||||||||||||||||||||||||||||||||
Stems | branched distally, (3–)5–10 dm. |
(simple or few to several from base), erect [ascending, decumbent], branched basally and/or distally, (glabrous or pubescent). |
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Leaves | basal and cauline; petiolate or sessile; basal (soon caducous), rosulate or not, petiolate, blade margins entire or dentate; cauline sessile, blade (base auriculate, sagittate, or amplexicaul), margins entire or dentate. |
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Basal leaves | rosulate; petiole 0.3–3 cm; blade oblanceolate, (1.5–)2.5–14.5(–20) cm × 10–30(–42) mm, margins dentate to subpinnatifid. |
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Cauline leaves | sessile; blade lanceolate to oblong, base auriculate, margins usually entire, rarely dentate. |
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Racemes | lax or dense. |
(corymbose, dense or lax), considerably [slightly] elongated in fruit. |
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Flowers | sepals erect, purple, 5–7.5 × 1.7–2.5 mm; petals purple to lavender or white, spatulate, 10–14 × 1.2–1.7 mm, claw 4–6 mm; median filament pairs 4–6 mm; anthers linear, 3–4 mm; gynophore (slender), 3–6(–9.5) mm. |
sepals (equal), usually erect, sometimes ascending or spreading, rarely reflexed, oblong, lateral pair not saccate basally; petals (erect basally), usually white, lavender, or purple, rarely yellow, oblanceolate, oblong, spatulate, or obovate, (margins rarely crisped), claws differentiated or not from blade, (apex rounded); stamens tetradynamous, (exserted); filaments distinct; anthers usually linear, sometimes ovate or oblong (apically coiled); nectar glands confluent, subtending bases of stamens. |
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Fruiting pedicels | horizontal to divaricate-ascending, often upcurved, 6–9 mm. |
erect to ascending or divaricate, slender. |
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Fruits | ascending to divaricate or descending, straight or slightly recurved, torulose, 4.5–9 cm × 1.1–1.4 mm; ovules 80–112 per ovary; style cylindrical, (stout), 0.3–1 mm; stigma 2-lobed. |
stipitate, linear, torulose or smooth, terete; valves each with prominent midvein, usually glabrous, rarely pilose; replum rounded; septum complete; ovules 20–114 per ovary; style distinct, (cylindrical or subclavate to clavate); stigma capitate, usually strongly 2-lobed, rarely entire, (lobes opposite replum). |
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Seeds | 1.2–1.5 × 0.8–1.2 mm. |
uniseriate, plump, not winged, oblong; seed coat (minutely reticulate), not mucilaginous when wetted; cotyledons incumbent or obliquely so. |
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x | = 10, 11. |
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2n | = 22. |
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Thelypodiopsis ambigua |
Thelypodiopsis |
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Phenology | Flowering Mar–Jun. | |||||||||||||||||||||||||||||||||
Habitat | Pinyon-juniper desert shrub communities, dry hillsides | |||||||||||||||||||||||||||||||||
Elevation | 800-1600 m (2600-5200 ft) | |||||||||||||||||||||||||||||||||
Distribution |
AZ; UT
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w United States; n Mexico |
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Discussion | Of conservation concern. Thelypodiopsis ambigua is known from Kane County in Utah and from Coconino, Mohave, and Yavapai counties in Arizona. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species 10 (9 in the flora). As recognized by R. C. Rollins (1982b, 1993), Thelypodiopsis was artificially delimited, and no single characteristic or combination of characteristics reliably distinguished it from related genera. Rollins’s circumscription was so broad that it included species of Dryopetalon and Romanschulzia O. E. Schulz. Of the nine species of Thelypodiopsis that occur in the flora area, three (T. purpusii, T. shinnersii, and T. vaseyi) are quite anomalous and, together with the Mexican T. versicolor (Brandegee) Rollins (Coahuila, San Luis Potosí), eventually may be excluded from the genus. Unlike the other six species, these three have entire or obscurely (versus prominently) 2-lobed stigmas, oblong or ovate anthers 0.5–1 mm (versus linear and 2.5–4 mm), and petal claws obscurely (versus strongly) differentiated from blades. They are here retained in the genus only tentatively and currently are being subjected to detailed molecular and morphological studies, along with Mexican, Central American, and South American taxa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 7, p. 725. | FNA vol. 7, p. 723. | ||||||||||||||||||||||||||||||||
Parent taxa | Brassicaceae > tribe Thelypodieae > Thelypodiopsis | Brassicaceae > tribe Thelypodieae | ||||||||||||||||||||||||||||||||
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Synonyms | Thelypodium ambiguum, Sisymbrium ambiguum, T. ambigua var. erecta | |||||||||||||||||||||||||||||||||
Name authority | (S. Watson) Al-Shehbaz: Contr. Gray Herb. 204: 138. (1973) | Rydberg: Bull. Torrey Bot. Club 34: 432. (1907) | ||||||||||||||||||||||||||||||||
Web links |